Noise effect of test mass surface roughness in spaceborne gravitational wave detectors
Noise effect of test mass surface roughness in spaceborne gravitational wave detectors
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DOI：
10.1103/physrevd.108.042001
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发表时间：
2023-05
影响因子：
5
通讯作者：
Hao Yan;H. Miao;Shun Wang;Yiqiu Ma;Zebing Zhou
中科院分区：
文献类型：
--
作者：
Hao Yan;H. Miao;Shun Wang;Yiqiu Ma;Zebing Zhou
星载引力波探测任务对位移传感的精度有很高的要求，而位移传感是通过激光场与测试质量相互作用来实现的。然而，由于被测质量反射面的粗糙度，其他自由度的残馀运动会使沿敏感轴线的位移测量产生耦合误差。本文建立了测试质量残差随机运动与敏感轴位移传感的耦合模型，推导了星载引力波探测器表面误差精度的解析公式。我们的结果表明，这种耦合误差不会对LISA导航仪中的测试质量块的比表位移传感造成污染。
Spaceborne gravitational wave detection mission has a demanding requirement for the precision of displacement sensing, which is conducted by the interaction between the laser field and test mass. However, due to the roughness of the reflecting surface of the test mass, the displacement measurement along the sensitive axis suffers a coupling error caused by the residue motion of other degrees of freedom. In this article, we model the coupling of the test mass residue random motion to the displacement sensing along the sensitive axis and derived an analytical formula of the required precision of the surface error for the spaceborne gravitational wave detectors. Our result shows that this coupling error will not contaminate the picometer displacement sensing for the test masses in the LISA pathfinder.